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        This is the heart of the application because it exposes the functionality (uses cases)of the system to the
        user.
        This service layer should be stateless, it is a good practice to make this singleton.
        
        This should be single point of entry and coarse-grained so that transaction and security can be applied.
        
        THIS IS THE HEART OF THE APPLICATION. all kind of technology could use this services, such as JSP,PDF, REST services.
        This is implemented independently of the technology
        
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